https://astonishing-marigold-c4563e.netlify.app

Performance

· 22 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

Mobile Desktop

Performance

Accessibility

100

Best Practices

100

SEO

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

794 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

794 ms

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

794 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

794 ms

Page Load Progression

375 ms

750 ms

1.1 s

1.5 s

1.9 s

2.2 s

2.6 s

3.0 s

Checks

15 PASS 4 REVIEW

HTTP/3 (QUIC)

HTTP/3 not advertised

REVIEW

HTTP/3 not advertised

HTTP/3 (QUIC) is not advertised

HTTP/3 isn't advertised via Alt-Svc and the worker didn't negotiate h3. HTTP/3 reduces handshake latency (1-RTT instead of 2-3 RTTs) and is more resilient on lossy connections. Most modern CDNs (Cloudflare, Fastly, AWS CloudFront, Google Cloud CDN) support HTTP/3 with a single config switch -- consider enabling for mobile-heavy workloads.

Server-Timing Observability

No Server-Timing header found

REVIEW

No Server-Timing header found

Server-Timing exposes backend timing breakdowns to browser DevTools (e.g., `db: 45ms; render: 120ms; cache: 2ms`). Useful for diagnosing slow pages without backend log access. Most modern frameworks (Next.js, Cloudflare Workers, Fastly) emit it automatically; absence on a managed platform usually means telemetry headers are stripped at the edge.

Green Hosting

Action

Whether the site is served from green-energy infrastructure

REVIEW

Green Hosting

No green hosting detected

HTTP Caching

public,max-age=0,must-revalidate

REVIEW

public,max-age=0,must-revalidate

Cache-Control header is set

Got: public,max-age=0,must-revalidate

ETag present — enables conditional (304) responses

Cache-Control

public,max-age=0,must-revalidate

Directive	Value	Meaning
public	—	Any cache may store this response
max-age	0	Cache for 0 seconds
must-revalidate	—	Must recheck with server after expiry

A+

Page Weight Budget

480 KB transferred, 14 requests

PASS

480 KB transferred, 14 requests

Page weighs 518 KB (480 KB transferred)

14 HTTP requests

Estimated 0.10 g CO2 per page load

480 KB transferred

14 requests

0.10 g CO2 per page load

Images 406.8 KiB 85%

Fonts 47.3 KiB 10%

Other 14.9 KiB 3%

CSS 4.9 KiB 1%

HTML 4.8 KiB 1%

JavaScript 1.7 KiB 0%

0 2.4 MB 4.9 MB

Under budget

A+

Third-Party Impact

10% third-party, 0 ms blocking

PASS

10% third-party, 0 ms blocking

Third-party code accounts for 10% of page weight (48.5 KiB of 480.4 KiB)

Third-party blocking time is low (0 ms)

90%

First-party Third-party

A+

Text Compression

All text resources are compressed

PASS

All text resources are compressed

All text resources are properly compressed.

Image Optimization

9 images, 0 KB saveable

PASS

9 images, 0 KB saveable

https://astonishing-marigold-c4563e.netlify.app/as... is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

is missing width/height — may cause layout shift

Set explicit width and height to prevent CLS.

9 images 407 KB

0 oversized -0 KB

1 legacy format

2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Performance issues directly impact user engagement and conversion rates.

A+

JS Execution Cost

190ms total JS execution

PASS

190ms total JS execution

https://astonishing-marigold-c4563e.netlify.app/: 190ms CPU time

Main Thread Breakdown

Style & Layout 61% Other 26% Rendering 7% Script Evaluation 4%

Script	Total	Scripting	Parse/Compile	Party
https://astonishing-marigold-c4563e.netlify.app/	190ms	3ms	0ms	1st

A+

Font Loading

1 fonts (47 KB)

PASS

1 fonts (47 KB)

1 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

47 KB total

Render-blocking

of 1

Dominant font-display

swap

Most common across fonts

Font loading timeline

Transfer FOIT (block) FOUT (swap)

UcC73FwrK3iLTeHuS_nVMrM... woff2 swap

Size 47 KB

Load time 8 ms

Start 325 ms

Risk FOUT — text flashes from fallback to web font

Optimization checklist

Preload critical fonts (priority=high)
Use woff2 format for all fonts
Set font-display to swap, optional, or fallback
Subset large fonts (≤100 KB each)

A+

JS Bundles

1 scripts, 0 KB unused

PASS

1 scripts, 0 KB unused

0 KB unused JavaScript

Downloaded but never executed on this page.

Script	Size	Unused	Minified	Party
https://astonishing-marigold-c4563e.netlify.app/assets/js/main.js	2 KB	—	✓	1st

A+

Resource Caching

All resources properly cached

PASS

All resources properly cached

No caching issues found

All static resources have appropriate caching headers.

A+

Critical Rendering Path

No render-blocking resources

PASS

No render-blocking resources

No render-blocking resources detected

A+

Resource Hints

No optimization needed

PASS

No optimization needed

No resource hint issues

A+

Document Compression

Document response uses brotli

PASS

Document response uses brotli

Main HTML response uses brotli (Content-Encoding: br)

Brotli is the best text-compression algorithm for general use, ~20% smaller than gzip on average (40% on smaller files). Modern browsers all support it.

A+

LCP Image Preload

LCP preload audit not available

PASS

LCP preload audit not available

LCP image preload audit not available for this scan

A+

Main HTML Cache-Control

Main HTML max-age=0 (≤ 5min) is appropriate

PASS

Main HTML max-age=0 (≤ 5min) is appropriate

Got: public,max-age=0,must-revalidate

A+

Server Response Intelligence

3 server-response signal(s) detected

PASS

3 server-response signal(s) detected

`Cache-Status` header present (RFC 9211): "Netlify Edge"; fwd=miss; fwd-status=200; stored

The page returns a `Cache-Status` header -- the standardized way for CDNs and caches to communicate per-hop cache state to debugging tools. Format: `Cache-Status: cdn-name; hit; ttl=300` (or `; fwd=miss` / `; fwd=stale`). Standard alternative to vendor-specific `X-Cache` patterns each CDN had historically. Cloudflare, Fastly, and Akamai all support emitting it.

`Vary` header declared: Accept-Encoding

The page declares a `Vary` header, telling downstream caches which request headers the response varies on. Critical for content-negotiated responses (compression, language, cookies, device class).

`ETag` present -- conditional GET supported

A+

Page Weight Inventory

14 resources · 480 KB · 0 KB savings available

PASS

14 resources · 480 KB · 0 KB savings available

Within 1MB page-weight target

Got: 480 KB

2 third-party resources (10% of weight)

14 resources · 480.4 KiB · 2 third-party Within 1MB page-weight target

Image 88% · 421.7 KiB

Font 10% · 47.3 KiB

CSS 1% · 4.9 KiB

Document 1% · 4.8 KiB

JavaScript 0% · 1.7 KiB

#	Resource	Type	Size	Cache	Unused	3rd party	Issues

14 resources			480.4 KiB

Asset Compression

No text asset hosts to measure

INFO

No text asset hosts to measure

No third-party or subdomain host served enough text assets to measure

Asset compression is measured per host, from one HEAD request against a sampled resource. Pages that serve all their JS and CSS from the document's own origin are covered by the document compression check instead.

Network Waterfall

14 requests over 457ms

INFO

HTML JavaScript CSS Images Fonts XHR/Fetch Other

Image Optimization

8 images, 298 KB total, 260 KB wasted

INFO

Image Optimization Audit

Total Images

Total Size

298 KB

Oversized

Wasted

260 KB

8 missing dimensions

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.